High-speed low power consumption true single-phase clock 2D type two-thirds dual-mode frequency divider

Abstract

The invention discloses a high-speed low power consumption true single-phase clock 2D type two-thirds dual-mode frequency divider which comprises two D triggers, a mode switching control unit and a self-adaptive power consumption control unit, wherein the D triggers adopt synchronous triggering, and the CK end of each D trigger is connected with input clock, and the D end of each D trigger is connected with the output of a logic control unit; the input of the mode switching control unit is connected with frequency dividing ratio control end MODin and P; and the input of the self-adaptive power consumption control unit is connected with the output of the trigger unit and the output of the mode switching control unit. The control circuit provided by the invention is embedded and integrated in the D triggers, the D triggers adopt ratio logic to reduce the capacitive load so as to improve the working speed, the clock jitter introduced by the frequency divider is reduced by the synchronous working mode, under equal high-speed states, compared with the current of a current mode logic structure, the current of the true signal-phase clock is reduced from milliamp to microamp grade, the four D triggers in the prior art are reduced to two D triggers through optimization, the triggers are saved by a half, and correspondingly, the area and the power consumption are also reduced, and the self-adaptive power consumption control mode is configured according to the frequency dividing ratio, so that the power consumption of the dual-mode prescalar is further saved by 50%.

Description

technical field [0001] The invention relates to a frequency synthesizer with a PLL structure, in particular to a high-speed and low-power true single-phase clock 2D type 2 / 3 double-mode frequency divider. Background technique [0002] In a wireless communication system, the receiving system needs to restore the modulated radio frequency or microwave signal to the original signal or data, while in the transmitting system, the signal or data needs to be modulated to radio frequency or microwave frequency for long-distance transmission. In the process of receiving and sending, it is inseparable from the local oscillation signal, down-converting the receiving signal and up-converting the transmitting signal. [0003] The local oscillation signal is usually generated by a frequency synthesizer based on a phase-locked loop. The frequency synthesizer usually includes a voltage-controlled oscillator, a frequency and phase detector with a charge pump, a multi-mode frequency divider, ...

AI Technical Summary

Problems solved by technology

The traditional 2 / 3 dual-mode frequency divider cannot automatically turn off some unused D flip-flops when the frequency division ratio is switched to further reduce power consumption

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